Gut feelings

Lynn
Any of you ladies ever have a gut feeling that something just isn't adding up within your relationship with your guy? I've been feeling that way for a few days now. Always glued to his phone and he finally left it sit while he was showering and I snuck into his phone. Fb messages show "favorites" and their all females that I know he's talked to before in a bad way. I also found where he is visiting his ex's fb page a lot lately. 
Last time this happened he had sent some texts to a female we both recently met talking about your hot and I want to take you out to dinner. 
He hasn't even noticed me not feeling myself lately and when confronted he just gets mad saying I shouldn't be going thru his phone. 
any experiences like this?